The following list contains the number of hours that a sample of
9
middle-school students spent watching television last week.
19
,
15
,
8
,
9
,
16
,
7
,
20
,
18
,
15
Find the median number of hours for that sample.
hours
First, we need to arrange the numbers in ascending order: 7, 8, 9, 15, 15, 16, 18, 19, 20.
Since there are an odd number of values (9), the median will be the middle value.
The middle value is the 5th value, which is 15.
Therefore, the median number of hours for that sample is 15 hours.
A group of
10
students from the same middle school have been asked to record how much time they spent this morning traveling from home to school. Here are the results (in minutes).
16
,
12
,
8
,
7
,
4
,
7
,
13
,
5
,
14
,
5
Find the median travel time for that group of students.
minutes
First, we need to arrange the numbers in ascending order: 4, 5, 5, 7, 7, 8, 12, 13, 14, 16.
Since there are an even number of values (10), the median will be the average of the middle two values.
The middle two values are the 5th and 6th values, which are 7 and 8.
Therefore, the median travel time for that group of students is (7 + 8) / 2 = 7.5 minutes.
Here are the weights (in pounds) of a sample of
13
male eleventh graders.
162
,
149
,
145
,
155
,
172
,
170
,
148
,
168
,
142
,
145
,
144
,
162
,
143
Find the median weight of these students.
pounds
First, we need to arrange the numbers in ascending order: 142, 143, 144, 145, 145, 148, 149, 155, 162, 162, 168, 170, 172.
Since there are an odd number of values (13), the median will be the middle value.
The middle value is the 7th value, which is 149.
Therefore, the median weight of these students is 149 pounds.
To find the median, we first need to arrange the hours in numerical order:
7, 8, 9, 15, 15, 16, 18, 19, 20
The median is the middle value when the numbers are arranged in order. Since there are 9 numbers in the sample, the middle value is the 5th number.
The median number of hours for the sample is 15 hours.
To find the median number of hours for the given sample, you need to arrange the numbers in ascending or descending order and then find the middle value.
First, let's arrange the numbers in ascending order:
7, 8, 9, 15, 15, 16, 18, 19, 20
Since we have an odd number of values (9 in total), the median will be the middle value, which is the fifth value in this case.
Therefore, the median number of hours for the sample is 15 hours.